Class III prep - breaking the contact

[waxthrowaway123]

We are learning class III preps in pre-clinic right now, and we are being told that when prepping from the lingual we have to extend the prep gingivally enough to be able to see a crescent shape slightly on the facial side. I am not completely clear on what this means exactly or how to do this. Can anyone clarify?

Thank you.

 

[Dental2000]

 

[SableFire]

 

[waxthrowaway123]

Yes, those are exactly what I am talking about! How do you correct a prep to give it that crescent shape if it is missing one? Are you actually removing tooth structure from the interproximal surface?

 

[SableFire]

Yes, those are exactly what I am talking about! How do you correct a prep to give it that crescent shape if it is missing one? Are you actually removing tooth structure from the interproximal surface?

Keep removing tooth structure until you see it. I sometimes like to use the Jeffery 7 to keep removing tooth structure if it is a lingual access. You use a round bur in a slow speed.

 

[waxthrowaway123]

Keep removing tooth structure until you see it. I sometimes like to use the Jeffery 7 to keep removing tooth structure if it is a lingual access. You use a round bur in a slow speed.

Thank you! I think my instructor misspoke or I misheard. I talked to a few people and everyone was saying that you do have to remove tooth structure from the interproximal area to obtain the correct shape, not extend the prep gingivally. I appreciate all the great advice!

 

[Dental2000]

Thank you! I think my instructor misspoke or I misheard. I talked to a few people and everyone was saying that you do have to remove tooth structure from the interproximal area to obtain the correct shape, not extend the prep gingivally. I appreciate all the great advice!

Yes, you do remove tooth structure interproximally but you still need to maintain contact between the adjacent teeth even if its a slight contact

 

[virajpatel]

How do you guys bevel a class III (what do you use? and where exactly do you place the bevel?). I have been told different things but is only place on the C-shaped portion of the prep or is it present on the incisal and cervical parts of the prep, as well?

 

[Bernie Sanders]

Gotta break ginigval contact. Don't break incsial. Dont extend prep past ridge.

 

[virajpatel]

Gotta break ginigval contact. Don't break incsial. Dont extend prep past ridge.

so since the contact is an area, you're saying we can break the lower part of the contact